Principle and method for forming semisolid and solid extruded circumferential self-enhanced plastic pipes
A self-reinforced plastic, solid-state extrusion technology, used in tubular items, other household appliances, household appliances, etc., can solve the problems of high circumferential strength, inability to retain a large amount, etc., to improve heat resistance, enhance practical needs, raw materials low cost effect
Inactive Publication Date: 2010-06-23
CHONGQING TECH & BUSINESS UNIV
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Problems solved by technology
[0003] The purpose of the present invention is to overcome the shortcomings that the pipes produced by the current conventional plastic pipe extrusion molding method cannot meet the shortcomings of thin wall, low cost and high circumferential strength, etc., especially the new methods that have emerged in recent yea
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[0017] Before extruded pipe production, through the temperature control and adjustment function of the temperature control and adjustment device 5 and the temperature detection and feedback of the thermocouple in the temperature measuring hole 4, the entire circumferential shear stress field extrusion device is placed at the melting point temperature of the formed material. In the temperature environment below until the temperature inside the entire device is uniform, the extruder is turned on to extrude the molten material 3, and the molten plastic 3 has cooled to solid and semi-solid when flowing through the circumferential shear stress field extruding device When the solid and semi-solid mixed melt flows through the circumferential shear stress field section of the mandrel 2, due to the shear induction of the shear rotating sleeve 1, the molten plastic 3 produces linear crystal nuclei—the original The linear crystal nuclei are continuously grown, oriented, and ordered under ...
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The invention relates to a principle and a method for forming semisolid and solid extruded circumferential self-enhanced plastic pipes and is characterized in that the semisolid and solid pipe extruding and forming technology is realized in the circumferential shear stress field in the environment with temperature lower than the melting point temperature of forming material. The technological steps comprise drying raw materials, plasticizing through an extruder, melting and extruding, semisolid and solid extruding, self-enhancing and forming, cooling and setting, and cutting and collecting. The plastic pipe produced by using the method of the invention has the advantages that the strength and the modulus in the circumferential direction of the pipe are obviously enhanced, the performance of the material is configured in an optimizing way, and the degree of satisfaction to the practical requirements on the performance of the material of the pipe subject to internal pressure is promoted. After being enhanced, the thickness of the crystal plate of the enhanced pipe is thicker and the degree of crystallization is higher, so the heat resistance is obviously improved when being compared with the ordinary pipes. The invention has the advantages that the equipment investment is small, the cost of raw materials is low, the production cost is low, the performance of the product is quite excellent and the industrialization prospect is good.
Description
Technical field: [0001] This technology relates to the principles and methods of manufacturing various plastic pipe parts, especially the principle and method of semi-solid and solid extrusion molding of plastic pipes that realize obvious self-reinforcement in their circumferential direction. The invention belongs to the technical field of manufacturing plastic parts. Background technique: [0002] With the continuous development of the national economy and national infrastructure construction, the demand for large-diameter plastic pipes has become more prominent. In the water supply system, large-diameter pipes are often used as main pipes, and the pressure of the conveyed fluid is relatively high. However, at this time, since the circumferential stress of the pipe under internal pressure is twice its axial stress, the wall thickness of the pipe must be adjusted The thicker design can meet the requirements of its circumferential strength. Therefore, in order to increase t...
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Login to View More IPC IPC(8): B29C47/24B29L23/00B29C48/33
Inventor 袁毅沈洪雷高雪芹李又兵申开智
Owner CHONGQING TECH & BUSINESS UNIV